The attackers hopped over a crumbling brick wall, wearing backpacks and belts with dangling grenades. They were young and wore beards, and by 7:30 a.m. on Monday, they were firing machine guns into an unarmed crowd of young police recruits.

Pakistan’s most populous province, Punjab, came under attack for the second time this month. This time, militants hit several hundred police cadets caught off guard during a morning drill at their academy in this village near Lahore, Punjab’s capital.

The attackers issued no demands but went on a rampage, killing at least eight recruits and instructors. One attacker was killed in the siege that followed and, in a gory finale, three detonated suicide belts, killing themselves. More than 100 people were wounded.

A suicide bomber wearing a police uniform blew himself up in a government building on the southern outskirts of the city of Kandahar on Monday, killing at least eight people, including five police officers and three civilians, and wounding six others, officials said.

The attack took place a few minutes before noon on the second floor of the building, in an area where Afghan identification cards are issued, said Gen. Ghulam Ali Wahdat, the regional head of police. The district police chief was among the wounded, he said.

Al Qaeda in the Arabian Peninsula took credit in an internet statement Friday for a pair of suicide attacks that targeted South Koreans in Yemen.

A teen-aged suicide bomber killed four South Korean tourists in Shibam, Hadramout on March 15. A second terror attack three days later in Sana’a targeted a convoy of family members and South Korean investigators. The motorcade had left a military camp and was traveling along a highway when a suicide bomber detonated his device between two of the cars. There were no injuries to the passengers.